Mezzanine board



FIG. 1 is a right side, top perspective view of a mezzanine boardshowing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is a left side, bottom perspective view thereof.

The broken line portions form no part of the claimed design.

CLAIM The ornamental design for a mezzanine board, as shown anddescribed.